Method of making a locking ring and plate assembly



Dec. 11, 1951 SANDBERG 2,578,021

METHOD OF MAKING A LOCKING RING AND PLATE ASSEMBLY Original Filed March26, 1946 2 SHEETSSHEET 1 K O O c a O C 4 A E o o I o J( ZZZ/5277GT PayA. Sana hwy Dec. 11, 1951 R. A. SANDBERG 2,578,

METHOD OF MAKING A LOCKING RING AND PLATE ASSEMBLY 2 SHEETS-SHEET 2Original Filed March 26, 1946 Ray ,4. Sam/berg Patented Dec. 11, 1951 IUNITED. STATE TENT OFFICE METHOD or MAKING AVLOCKING RING AND :PLATEASSEMBLY 2-Claims (Cl.113121) This invention-relates: to. improvements:ina locking. ring and plate assembly. and to a new andi novels methodof making the. same,. the assembly being ofrthe character highlydesirable for use. iniacontainer fora-oil filteringv cartridgesonthelike, although the invention will have. other uses and purposesasiwill be apparent. to one skilled in the art..

This. application is adivision of my co-pending application entitled:Filter Cartridge Container and Methodof Making: the. Same," filed; March26,1946; Seria1;l\I0.: 657,121..

In the. past; many andvarious typesgofinterlocking assemblies havebeenmade to hold parts together against the-action. of spring, resilient,or. other. means tending. to vseparate those. parts, andfrequentl thepressure; of the means tend.- ingzto separate the interlocking partswasapplied to;:the 1 weakest portion ,of'the structure.- Also,wheregxtheqtwomarts of. the. interlocking assembly were .made of,separate pieces, that is, initially different pieces, some difiicultywasfrequently experienced. in endeavoring to make the pieces fit.

preperlyafter having been mass produced. I Like- WiSfi'ii Considerablesacrifice in economy and manufacture has resulted from previou methodsof making such interlocking assemblies in the past.

With the foregoing in mind, it is an important object of .the instantinvention to provide a locking ring and plate assembly of such characterthatlboththe ring and plate are formed. from anflinitially single pieceblank of material..

Itis also a featureof thisinvention toprovide a,- 1ocking ring, andplate assemblyof such char.- aeter that theonly-metalwaste during theprodnctioncf both parts resides in the provision of openings ,orapertures in the plate, if such are esired.

Still anotherobject .of this invention i the provision of. a new and.novel method of making a locking ring and plate assembly.

A. further feature. of the invention resides in the provision of .a. newand. novel method of making a loekingring assemblythat results in theprovision of an interlocking" ring and, plate that may be producedwithgreatrapidity and mass production with the proper fit betweenthemalwaysassured.

Still another object of this invention is the provisionofanew and novelmethod ofmanufacturing a locking ring and plate assembly that is capableof withstanding heavy pressure, and which is so constructed that.anyload imposed upon the. relative parts is. transferred .to thelocation of the interlockbetween the parts and. with the instantassembly, the interlocking, portions are otconsiderablearea...

It is :also .a featurepf the inventionton provide a locking ringandplateassembly wherein; the parts may be interlocked with each other or dis.-engaged :with greatrapidity, stop means being provided to insuretheproper interlock between the parts even upon careless handling,

While some of themore salient features, char acteristics and advantages,of the instant invention have been abovepointed out, others.willbecome-apparent from the following disclosures, taken in conjunctionwith the accompanying drawings, in which:

Figure 1 isafragmentary verticalsectional view, with parts'in elevation,of an oil filter casinglequipped with a lockingring and. plate assemblyembodying improvements of the instant invention;

Figure 2 is a plan vView of the structure of Fig. ure 1 with the coverremovedto illustrate. more clearly the assembly of this invention;

Figure 3 is a plan View of the lockingri-ngand plate assembly alone,illustrating early steps in the formation of these parts under themethod involved in this invention; and

Figure 4 is a central vertical sectionalview through the. assemblyitself illustrating later steps'in the process of forming theiassembly.

As shown on the drawings: 7

InFigure 1 the illustrated. embodiment of this invention is shown inassociation with a cone tainer for an oil filtercartridge, one example.of a use of the instant invention. In that showing, the containercomprises a casing. I generally of cylindrical shape, and it is to beassumedthat the casing has a closed bottom with theexeeption of an.outlet opening. The upper, portionin the casing is stepped outwardlyasinclicated at 2 to provide a cylindrical mouth margin-3,01 greaterdiameter than the body ofthe casing. At one point near its upper end,the casingmay be provided with an inlet fitting 4 through which oil.orother fluid to be .filtered may enter the casing. a

Inside the casing I is a center outlet tube 5 of which at least theupper portion, as illustrated, is. preferably constructed of a finefiltering material such as powdered .metal, orwhich maybe an extremelyfine mesh screen. Seatedon the upper end of this center tube is a hollowcap 6, and a rod! secured to a'lower portion of this structure extendsthrough both the filter portion 5 of-the center tube and the cap. On theouter extremity of this rod is a'nut 8. which, when tightened; holdsboth the filter portion 5 of the centertube-and the cap 6 in position.

Around the center tube 5 is a filter cartridge 9.of .any -satisfactory'known construction, such cartridges being centrally apertured for suchpositioning in a container. When dropped into a container, such a filtercartridge seats upon a suitable gasket to close the lower end thereofaround the central aperture, in substantially the same manner that theupper end is likewise closed by means of a gasket In which may be heldtightly in position by a collar ll carried on the lower end of a coiledspring [2, the upper end of which is engaged with an internally threadednut l3 that may, if'so desired, be permanently secured to a dome-shapedlocking plate I. In the illustrated instance such securement may beestablished by virtue of a stem of reduced diameter on the nutprojecting through an aperture in the locking plate, and the parts beingbrazed or equivalently secured together.

The locking plate It is removably engageable in an interlocking mannerwith a locking ring l5, and when so engaged, the spring I2 exerts adownward pressure upon the collar I l and gasket l'to hold the filtercartridge 9 in the casing against rattling, and to prevent'any escape offluid to be filtered through the end of the central opening or insidetube of the cartridge.

The locking ring I may be brazed or equivalently secured to the uppermarginal portion 3 of the casing I, if so desired. In this position itreinforces the mouth end of the casing and terminates flush therewith toprovide a better seat for an annular formation 3 on a dome-shaped coverIT. This cover is centrally apertured to accommodate a bolt I8, thethreaded shank of which is engageable in the aforesaid nut III totightly clamp the cover in position. While this is done, regardless ofthe force used in the clamping operation, all reactive stresses aretransferred to the marginal interlocking between the plate It and ringIS, a location that can adequately and readily bear the load. Withreference more particularly to Figures 1 and 2, it will be seen 4 theteeth 25 on the plate pass through the spaces between the teeth 20 onthe ring, and when the teeth 25 have dropped below the level of that thelocking ring, generally indicated by numeral I5, is angular in crosssection and includes an upright cylindrical portion l9, and the lowermargin of this portion is turned inwardly at sub stantially right anglesand cut to define a series of spaced teeth or projections 20. As seenclearly in Figure 2, the line of cut defining the space between adjacentteeth 20 is extended at one end along the base of the respective toothas indicated at 2|, and the free end portion 22 of the tooth is thenpreferably turned downwardly as seen clearly in Figure 4. When thisportion of a tooth is turned downwardly, the top edge thereof is at thesame time beveled or rounded to remove the relatively sharp corner.

The locking plate, generally indicated by nu:

meral M, if put to the use shown in Figure 1-,

preferably is provided with a centrally domed portion 23 which mergesinto an outer substantially horizontal annular portion 24 also'cut todefine spaced teeth or projections 25 therearound each of which is of asize to pass easily through i the space between adjacent teeth 20 on thering l5. Also, when used as illustrated in Figure 1, the plate It shouldbe provided with a central aperture 26 to receive the aforesaid clampingbolt l8. To facilitate manipulation of the plate to and frominterlocking engagement with the ring, the plate may also be providedwith one or more apertures 21 or equivalent formations, if so desired.

the ring teeth, a simple turning of the plate will bring the teeth 25beneath the teeth 20 to eflect the adequate interlock. The downwardlyturned ends 22 on the ring teeth 20 provide an automatic stop to theturning movement of the plate when the interlock is established. Ofcourse, with the plate and ring used in the manner shown in Figure l,pressing down of the plate is against the action of the coiled spring12, but some resistance against the plate at that time actually aids theinterlocking operation rather than making it more diflicult.

My novel method of making the plate It and locking ring l5 will now bedescribed with reference more particularly to Figures 3 and 4. Inconnection with these figures, it should be understood that the plate IIis in inverted position relatively'to the position of that plate inFigures 1 and 2. At the start of the method, a single blank of stock isdrawn to substantially the shape seen in Figure3. After the drawingoperation, the locking plate is severed from the locking ring in amanner to define the teeth 20 from the ring and the teeth 25 on theplate, such severance occurring along a staggered line of cut indicatedby numeral 28 in Figure 3. Simultaneously with this cutting operation,or immediately thereafter, the holes 26 and 21 may be punched in thedome portion of the locking plate, if the holes are desired. After thecutting operation, with the parts now appearing substantially as seen inFigure 4, a restrike is made upon the locking plate It to slightlyreduce its diameter so that the teeth 25 will pass freely through thespaces between the teeth 20 on the ring. This operation complet es theformation of the locking plate.

In connection with the ring, after the plate has been removed therefromby the cutting operation, like end portions 22 of each tooth orprojection 20 are struck downwardly as indicated by the dotted lines inFigure 4 and the upper corner portions beveled or sheared off to providea relatively smooth upper face to the ring. Upon the completion of thisoperation, the locking ring is finished.

' It is to be especially noted that in this method of making the lockingring and plate, there is no waste metal, or substantially no wastemetal, since the amount of metal lost by the provision of the apertures26 and 21 is clearly negligible. Thus, the manufacture of the lockingplate and locking ring is extremely simple, and highly economical,resulting in the provision of equally strong parts that are obviouslyaccurately fitted relatively to each other. Of course, it will beunderstood that if the locking plate is not desired with a central domeportion, that portion of the plate may be given some otherconfiguration, and the apertures 26 and 21 may be provided if desired,and omitted if desired.

purpose to limit the patent granted hereon oth- When it is desired tointerlock the plate l4 with the ring l5, it is a simple expedient toposition the plate relatively to the'ring so that erwise thannecessitated by the scope of the appended claims.

I claim as my invention:

1. The method of making a locking plate and locking ring assembly,including the steps of severing a single disc-like blank of material toprovide both the plate and ring bycutting the disc along a line of cutto define an inner circumferential row of spaced teeth on said ring andan outer circumferential row of spaced teeth of less width on the plateand extending the line of out along the base of each ring tooth at oneend thereof a predetermined distance, restriking the plate to reduce itsdiameter sufficiently to pass through the ring, and bending down saidone end of each tooth on the ring to function as a stop to insureinterlocking of the plate and ring teeth when the plate is insertedthrough the ring and rotated relatively thereto.

2. The method of making an interlocking assembly, including the steps ofdrawing a single blank to a desired shape, striking out the intermediateportion of said blank along a tortuous line of cut to form spacedoutward projections on said portion and spaced inward projections on theborder part around said portion and extending the line of out along thebase of each border projection at one end thereof a predetermineddistance, restriking said portion to reduce its area sumciently for theprojections thereon to pass readily through the spaces betweenprojections on said border part, and bending down said end portions ofthe projections on said border part to act as stop members to insurereleasable interlocking of the intermediate portion and border part whensaid portion is passed through and rotated relatively to the borderpart.

RAY A. SANDBERG.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

